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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17a0d6222d5f57d30142336325b6938f9d25ba4c70eb505bde6c96360836bb2' 
  AND token = '5sI2CYCXh8WYGRAo/tk5+X5Uozqw073ASts1DhMBjxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}